Meaning of bitter rot

bit'ter rot'

Pronunciation: [key]
— Plant Pathol. Plant Pathol.
  1. a disease of apples, grapes, and other fruit, characterized by cankers on the branches or twigs and bitter, rotted fruit, caused by any of several fungi.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.